Modular system lock



FIG. 1 is a perspective view of the modular system lock;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines showing the environment are for illustrative purpose only and form no part the claimed design. 

The ornamental design for a modular system lock, as shown and described. 